Wang Hongwei, Qi Suqing, Wang Jianguo, Cai Zhifang, Li Chuang
Dept of Orthodontics, Xingtai Eye Hospital, Xingtai 054001, China.
Hua Xi Kou Qiang Yi Xue Za Zhi. 2012 Dec;30(6):650-4.
To observe changes in tongue and hyoid position, and pharyngeal airway in patients with skeletal class III malocclusion after the combined orthodontic and orthognathic treatment.
Twenty patients were involved in this study. Cone beam CT (CBCT) was performed on patients one week before and six months after treatment. Raw data were reconstructed into three-dimensional model. To set up a three-dimensional reference frame, which was based by point "S", the sagittal and transversal measurements, cross sectional areas, partial and total volumes were computed. The three-dimensional position changes of chin, hyoid bone and tongue were measured in order to analyze the amount of mandibular setback relationship with the changes of pharyngeal airway, hyoid bone and tongue positions.
After treatment, the pharyngeal airway was constricted significantly. The hyoid significantly moved inferoposteriorly by 5.72 mm (backward) and 2.76 mm (downward) and the tongue moved posteriorly by 4.04 mm after surgery (P < 0.05). Among the 19 correlated indexes between the amount of mandibular setback and other measurements, 14 of which were significantly correlated (P < 0.05). The strongest correlation was found between the amount of mandibular setback and total volumes of pharyngeal airway (r = 0.834, P < 0.01).
Following combination therapy, the pharyngeal airway space decreased, the hyoid moved inferoposteriorly and tongue moved posteriorly. There were great correlations between the amount of mandibular setback and the changes.
观察正畸-正颌联合治疗后骨骼Ⅲ类错颌患者的舌位、舌骨位置及咽气道的变化。
本研究纳入20例患者。在治疗前1周和治疗后6个月对患者进行锥形束CT（CBCT）扫描。将原始数据重建为三维模型。以“S”点为基础建立三维参考框架，计算矢状面和横断面测量值、横截面积、部分体积和总体积。测量颏部、舌骨和舌的三维位置变化，以分析下颌后缩量与咽气道、舌骨和舌位置变化的关系。
治疗后，咽气道明显变窄。舌骨显著向后下移动5.72 mm（向后）和2.76 mm（向下），术后舌向后移动4.04 mm（P < 0.05）。在下颌后缩量与其他测量值的19个相关指标中，有14个显著相关（P < 0.05）。下颌后缩量与咽气道总体积之间的相关性最强（r = 0.834，P < 0.01）。
联合治疗后，咽气道间隙减小，舌骨向后下移动，舌向后移动。下颌后缩量与这些变化之间存在高度相关性。
